Single Outside Air Temperature (Oat) Reset; Multiple Outside Air Temperature (Oat) Reset - FHP 641-224 User Manual

Single Outside Air Temperature (OAT) Reset:

OAT> OAT Reset °F (adj.):
Controller will initiate cooling call to run compressors and modulate Re-heat Valve only when
the outside air temperature is greater than 55°F (Factory Default)
OAT< OAT Reset °F (adj.):
Controller will initiate a call for heating. Straight cool units will run their fan continuously or if the
unit is equipped with a Variable Frequency Drive (VFD) it will command the drive to maintain its
static pressure setpoint.

Multiple Outside Air Temperature (OAT) Reset:

OAT Reset °F < OAT< OAT Reset 2 °F (adj.):
Controller will command the unit to run free-cooling operation the fan will run continuously or if
the unit is equipped with a Variable Frequency Drive (VFD) it will command the drive to maintain
its static pressure setpoint.
OAT Reset 2 °F < OAT< OAT Reset 3 °F (adj.):
Controller will command the unit to run single stage of cooling operation, the valve will be set for
cooling operation and the first compressor will be commanded on, the fan will run continuously
or if the unit is equipped with a Variable Frequency Drive (VFD) it will command the drive to
maintain its static pressure setpoint and the re-heat valve will be modulated to maintain a 65°F
(Factory Default (adj.)) discharge air temperature setpoint .
OAT > OAT Reset 3 °F (adj.):
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